MyFitnessPal App Gets Venture Backing

While Weight Watchers struggles to keep its membership rolls from shrinking, its upstart challengers are beefing up.

The popular health-monitoring app MyFitnessPal LLC is getting $18 million in new funding from Kleiner Perkins Caufield & Byers and Accel Partners, a bet by the venture-capital firms that Americans are ready to take more control...